1. Division of Public Health Sciences, Department of Surgery; Washington University School of Medicine; St. Louis MO USA
2. Center for Advanced Methods Development; RTI International; NC USA
3. Agricultural Statistics Laboratory; University of Arkansas; Fayetteville AR USA
4. Saint Louis University School of Medicine; St. Louis MO USA
5. Minimally Invasive and Bariatric Surgery, Department of Surgery; Washington University School of Medicine; St. Louis MO USA